Hi to all, my mate just converted his Escort Cosworth to Autronic Ecu and wasted spark but is having problems with the original rev counter. It either revs slowly or twice it's actually reving. Any one can help please?
Thanks

 

Possibly the wiring is a bit dodgy?

 

You need a Autronic tacho adaptor this will sort out the rev counter issuse.

Mark

 

hi Thanks for the help

 

My other friend converted his escort to Autronic before and used the tacho adapter with no results! But we'll try our own if you say so! Thanks for the help

 

can anyone tell me where I can buy a tacho adapter for the sm4 ecu?

 

PM Mark Shead above he will be able to tell you.

 

If it's a simple square wave convertor you need, there are others that do the job, I fitted one to mine, as tacho did not work with new emerald ecu, cost me £30, and a emerald part, so all easy, that was because I went from std coil to coilpack so needed a square wave signal.
tabetha

 

Sorry being a bit ignorant but what should I do for this square wave signal and how should I fit it? Thanks

 

the std escos rev counter wont accept a basic square wave input, it needs a colappsing field back emf which peak to peak is much higher voltage than teh square wave